GM Lumina/Silhouette/Transport APVs 1990-1999 Repair Guide

Engine

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OIL LEVEL CHECK



  1. Make sure the vehicle is parked on level ground.
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  3. When checking the oil level it is best for the engine to be at normal operating temperature, although checking the oil immediately after stopping will lead to a false reading. Wait a few minutes after turning off the engine to allow the oil to drain back into the crankcase.
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  5. Open the hood and locate the dipstick that will be on either the right or left side depending upon your particular engine. Pull the dipstick from its tube, wipe it clean and then reinsert it.
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  7. Pull the dipstick out again and, holding it horizontally, read the oil level. The oil should be between the "FULL" and "ADD" marks on the dipstick. If the oil is below the "ADD" mark, add oil of the proper viscosity through the capped opening in the top of the cylinder head cover.
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  9. Insert the dipstick and check the oil level again after adding any oil. Be careful not to overfill the crankcase. Approximately 1 quart of oil will raise the level from the "ADD" mark to the "FULL" mark. Excess oil will generally be consumed at an accelerated rate.
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See Figures 1, 2 and 3

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Fig. Fig. 1: Pull out the oil level dipstick



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Fig. Fig. 2: The oil level should be within the crosshatched area on the dipstick



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Fig. Fig. 3: Use a funnel when adding oil to avoid spilling it

CHANGING OIL & FILTER



The oil is to be changed every 7,500 miles (12,500 km) or 12 months, which ever occurs first. Under normal conditions, change the filter at first oil change and then at every other oil change, unless 12 months pass between changes. We recommend that the oil filter be changed every time the oil is changed. About a quart of dirty oil remains in the old filter. For a few dollars, it is a small expense for extended engine Life.

If driving under such conditions, such as: dusty areas, trailer towing, idling for long periods of time, low speed operation, or when operating with temperatures below freezing or driving short distances (under 4 miles), change the oil and filter every 3,000 miles (5,000 km) or 3 months.

See Figures 4 and 5

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Fig. Fig. 4: Use a box wrench to break loose the drain plug



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Fig. Fig. 5: Keeping pressure against the plug while unscrewing, helps avoid hot oil spilling on your hands.

  1. Bring the engine to normal operating temperature, driving a short distance to the parts store to pick up the oil and filter is best way. Turn the engine off. Draining hot oil from the engine removes more acids and contaminants.
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  3. Raise the vehicle and support it on jack stands.
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  5. Obtain a drain pan with at least 6qts. capacity. Place the drain pan under the drain plug, in a position to catch the hot oil as it drains out. Loosen the drain plug using a socket and ratchet, or a box end wrench. The drain plug is the bolt inserted at an angle into the lowest point of the oil pan. Turn the drain plug out by hand, using a rag to shield your fingers from the hot oil. By keeping an inward pressure on the plug as you unscrew it, oil won't escape past the threads and you can remove it without being burned by hot oil. Quickly remove the oil pan plug and move your hands out of the way. Drain the hot, dirty oil into a catch pan. Allow a few minutes to drain the oil completely. Check the drain plug carefully. Look closely at the threads, make sure the are not crossed, or worn beyond re-use. Check the condition of the plastic drain plug gasket. If it is cracked or distorted in any way, replace it. Reinstall the drain plug and gasket.
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See Figures 6, 7 and 8

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Fig. Fig. 6: With the plug out, allow the oil to drain completely



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Fig. Fig. 7: Clean and inspect the oil drain plug and washer, and replace if necessary.



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Fig. Fig. 8: A special type oil filter wrench may be necessary, because of clearance.

  1. The oil filter is just about impossible to reach, or even see, from above, and almost as inaccessible from below. It may be easiest to remove the right front wheel to allow more access room on some models.
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  3. Place the drain pan under the oil filter.
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  5. Using an oil filter wrench (strap or cap type), loosen the oil filter. Use caution because the filter is very hot.
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Reardless of which type wrench you decide to use, be sure to obtain the correct size; filter wrenches come in different sizes (as do oil filters), and one size does not fit all.

  1. If the oil filter is on so tightly that it collapses under pressure from the strap wrench, move the wrench as close as possible to the engine. If the filter hasn't torn, but can't turn, it maybe to your advantage to take the vehicle to a shop before a leak develops. It is next to impossible to cut these filters off without special tools. Make sure you are turning it counterclockwise.
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See Figure 9

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Fig. Fig. 9: Removing the oil filter will cause oil to drip out

  1. Unscrew the filter and place it in the oil catch pan. Using a clean rag, wipe the filter-mounting surface.
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To install:
  1. When ready to install the oil filter, spread a small amount of clean oil on the sealing gasket. Screw the filter on by hand until the gasket makes contact. Then tighten it by hand an additional 3 / 4 of a turn. Do not overtighten. Install the oil pan plug and torque to no more than 20 ft. lbs. (27 Nm).
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  3. Using a funnel, add oil through the valve cover cap. Approximate oil capacity with a new filter, is 4.5qts. (4.3liters). Lower the vehicle, start the engine and inspect for oil leaks.
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See Figures 10, 11 and 12

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Fig. Fig. 10: You may want to wear protective gloves when changing the filter



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Fig. Fig. 11: Clean the mounting boss with a clean, lint free rag before installing a new filter



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Fig. Fig. 12: Before installing a new oil filter, lightly coat the rubber gasket with clean oil


CAUTION
Do not run the engine above an idle until the engine has built up oil pressure, as indicated by the oil light going out.

  1. Turn the engine off, and allow the oil to drain back into the crankcase for a minute, then recheck the oil level. Check for any leaks and correct as necessary.
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When you have finished this job, you will notice that you now possess four or five quarts of dirty oil. Pour the dirty oil into some type of plastic jug, an old milk carton, or even an old antifreeze container, will suffice. Now you can dispose of it by taking it to a recycling center.

Improperly disposing of used motor oil, not only pollutes the environment, it violates Federal law. Dispose of waste oil properly.

 
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